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Sheet conveying path switching device used in image forming apparatus, and sheet conveying device

a switching device and conveying path technology, applied in the field of conveying path switching device, can solve the problems of increasing the risk of paper jam, increasing the cost, and inhibiting the stable conveyancing operation, and achieve the effect of stable operation

Inactive Publication Date: 2010-05-04
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution allows for stable conveyance of various sheet types without paper jams, reduces device size, and maintains cost-effectiveness by using a simple and compact configuration with an electrically conductive belt to prevent frictional electrification.

Problems solved by technology

For this reason, there is a problem that the highly rigid sheet or special type of sheet cannot go forward along the conveying path formed in the curvature section, causing a paper jam or conveyance failure that inhibits stable conveyance operation.
However, such conveying means requires a suction device, thus there is a disadvantage that the configuration of the sheet conveying device becomes complex and the size of the same increase, causing a cost increase.
However, there is a problem in this device that a risk of a paper jam increases, as described hereinafter.

Method used

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  • Sheet conveying path switching device used in image forming apparatus, and sheet conveying device
  • Sheet conveying path switching device used in image forming apparatus, and sheet conveying device
  • Sheet conveying path switching device used in image forming apparatus, and sheet conveying device

Examples

Experimental program
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first embodiment

[0047]Hereinafter, the present embodiment is described with reference to the drawings.

[0048]FIG. 5 shows a schematic configuration of a full-color printer (referred to as “printer” hereinafter) 100, which is an example of the image forming apparatus according to the present embodiment. This printer 100 has a belt-like photoreceptor 1 as a latent image supporting body. An unshown charging device, a writing optical unit 2 as an exposure device, a multi-stage developing unit 3 as a development device, an intermediate transfer belt 11 as a transfer device, an unshown cleaning device and the like are disposed around the photoreceptor 1.

[0049]The multi-stage developing unit 3 has, starting from the bottom, development devices 3K, 3C, 3M and 3Y storing black, cyan, magenta and yellow developers respectively, the development devices being disposed detachably in a multi-stage manner. Here, references numerals K, C, M and Y represent members for black, cyan, magenta and yellow colors respecti...

second embodiment

[0106]Next, the present embodiment is described with reference to the drawings.

[0107]FIG. 10 shows a schematic configuration of a full-color printer 100A, which is an example of the image forming apparatus according to the present embodiment. As shown, the printer 100A is substantially the same as the printer 100 according to the above-described first embodiment shown in FIG. 5, except that the conveying path switching device 51 is configured differently. Therefore, repeated descriptions are omitted hereinafter, and mainly the configuration and operation of a conveying path switching device 91 of the present embodiment are described with reference to the drawings.

[0108]The conveying path switching device 91 of the present embodiment switches the conveyance direction of a recording sheet obtained after a toner image is fixed thereon by the fixing device 25, to guide the recording sheet to the sheet discharging tray 62 or the reversing device 80. FIG. 11 shows a schematic configuratio...

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Abstract

An easy-to-use, inexpensive, and small sheet conveying device, which can stably and separately convey not only sheets of a fixed size that are normally used, but also highly rigid sheets and special sheets, and can further separately convey a bent sheet reliably. In a sheet conveying path switching device having a sheet carrying-in path and a switching separating nail, outlines of two separating / conveying paths out of a plurality of separating / conveying paths positioned on a downstream side of the switching separating nail are configured by a movable belt surface, the two separating / conveying paths being located closer to the separating nail than the other separating / conveying paths.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an image forming apparatus, such as a copying machine, a printer and a facsimile device. More particularly, the present invention relates to a sheet conveying path switching device for switching a sheet conveyance direction in such an image forming apparatus, and to a sheet conveying device that uses this sheet conveying path switching device.[0003]2. Description of the Related Art[0004]In order to downsize the whole image forming apparatus, it is desired to reduce the size of a sheet conveying device that conveys a recording sheet as a recording medium from sheet storage means such as a paper cassette or a paper feed tray. Also, in recent years, image forming apparatuses that support various sizes and types of sheets have become popular. In such image forming apparatuses, sheets of several sizes and types are previously stored in sheet storage means, and a type or size of sheet that is ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B65H39/10B65H29/00
CPCB65H29/58B65H2301/3125B65H2404/632B65H2404/20
Inventor OKAMOTO, NAOYUKIWATASE, HIROYUKIUEDA, MASAYUKIUEDA, KENJISAGAWA, YASUHIROKAJIYAMA, HIROSHIISHIKAWA, YOSHIKUNI
Owner RICOH KK